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Explanation of mass number and atomic number using a lithium atom example.

Diagram illustrating mass number and atomic number with a lithium atom model, showing 3 protons and 4 neutrons, and the notation A, Z, X, and element symbol Li.

Diagram illustrating mass number and atomic number with a lithium atom model, showing 3 protons and 4 neutrons, and the notation A, Z, X, and element symbol Li.

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